Sectional steam-boiler



(No Model.) 2 Sheets-Sheet 1',

F. PROX. SEGTIONAL STEAM BOILER. No. 365,759. Patented June 28, 1887.

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2 Sheets-Sheet 2.

(No Model.)

PROX. SEUTIONAL STEAM BOILER.

PatentedJune 28,1887.

Witmeaaw $2 itb whim UNITED STATES PATENT @rrrcn.

FRANK PROX, OF TERRE HAUTE, INDIANA.

SECTIONAL STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 365,759, dated June 28, 1887.

Applicaiion filed April 25, 1887.

To all whom it may concern.-

Be it known that I, FRANK PROX, a citizen of the United States, residing at Terre Haute, 1n the county of Vigo and State of Indiana, have invented a new and useful Improvement in Sectional Steam-Boilers, of which the following is a specification.

My invention relates to an improvement in that class of steam-boilers whiehconsists of a series of like or similar sections secured together to form a common water and steam receptacle.

The objects of my improvement are, first, to provide a boiler-section which may be easily cast in one piece, and which shall present a large heatingsurface, and, second, to so group a series of such sections as to form a grate-sup port and fines which will insure the thorough circulation and utilization of the fire and heated gases, all as hereinafter fully described.

The accompanying drawings illustrate my invention.

Figure 1 represents a side elevation of one of the boiler-sections. Fig. 2 represents a sec tion through a, Fig. 1. Fig. 3 represents a section through I), Fig. 2. Fig. 4 represents a central vertical section of the entire boiler. Fig. 5 represents a rear elevation of the boiler. Fig. 6 represents a central horizontal section of the entire boiler. Figs. 7 and 8 represent an elevation and a plan of a modified form of my boiler.

Each section consists, substantially, of a pair of tubular elliptical rings, A. and I arranged one within the other, having a space between them and connected by short tubular bars 0 c and d (1. Two of the sections in each boiler are provided with a cross-bar, 0. (Shown in dotted lines in Fig. 1 and in section in Fig. 4.) Said bar 0 is arranged near the lower end of ring 13, and is for the purpose of forming a support for the grate-bars f. Each section is cast in one piece, and is provided with openings h h and Around each of the openings h and 'i is formed on one side of thesec tion a projection, j, and on the opposite side is a depression, 70, so that when a series of sections are laid together the projections of one section fit into the depressions of the next section.

In setting up a boiler I take first a section (marked 1 in Figs. 4. and 6) like that illus- Serial No. 236,007. (No model.)

trated in Fig. 1, except that it is provided with a cross-bar, e, as before described. This is set on edge. Next to this I place two sections (marked 2) made without the short tubular bars a 0. Then follows aseries of sections like Fig. 1, (marked 3,) proportioned in number to the capacity of boiler required and the length of the grate'bars. In the boiler shown said sec tions are three in number. Next comes another section 1, having the gratebar support 6; then two or more sections 2, and at last a section (marked 4.) formed without the lower half of ring B. As the several sections are put together a suitable packing is put into the depressions 7c in each section, thus forming a steam-tight joint around the openings 71. and 6. Through these openings communication is es tablished between the several sections. The several sections are clamped together by bolts Z Z and m m, passing through the openings hand t. Said bolts are of considerably less diameter than the openings, so as to leave a space all around the bolts. A plate, 0, covers all of the first section except a central opening, 1), opposite the grate, and the rear section is covered, except the upper half of the space between rings A and B, by a plate, It. A plate, 3, inserted between two of the sections, 80 serves to shut off-the space below the grate from the rest of-thc rear end of the fire-space, and, rising above the gratebars, answers the purpose of a bridge-wall to direct the flames to the upper part of the fire-space. It will be observed that when the boiler is complete the space between the rings A and B is divided by the bars 0 c and d d into four flues, t t and a u. The flues t't communicate with the lines a a only through the space in the sections 2 2, where there are no bars a, and the flues u a communicate with the fire-space inside the rings B only through the space .formed by leaving out the lower half of ring B in the last section, 4. The upper portions of sev- 95 eral of the sections are connected by a steampipe, T. w

In operation the interiors of rings B form the firespace, from which the fire and smoke pass backward and downward to the rear end ICG of dues a; thence forward along said flues to the openings 00 m, Fig. 6, through which they pass to fines t t, and backward along said dues to the chimney at the rear of the boiler. In

the modified form shown in Figs. '7 and 8 the sections are laid horizontally one above the other on a base, Bar, which carries the gratebars, and two or more of the sections have a portion of both rings cut away, and are joined by hollow bars In, which form a fuel-feeddoor-fraine, which, on account of the constantcirculation of water about it, cannot be warped or burned out.

I claim as my invention- 1. A boiler-section consisting of two tubular rings arranged one within the other, having a space between the rings, short tubular bars extending across said space and connecting said rings, and a tubular bar extending across the inner ring and adapted to form a grate-bar support, said rings and bars being all cast in a single piece, substantially as specified.

2. A boiler-section consisting of twotubular incomplete rings arranged 0ne w1th1n the other, having a space between the incomplete rings, said rings being connected at their ends 7 by tubular bars, all being cast in a single piece, substantially as specified.

3. The boiler consisting of the several sections 1, 2, 3, and 4, arranged as shown and described, the bolts passing through said sections and clamping them together, the grate arranged within the series of sections, and the plates closing the end sections, all combined and arranged to co-operate substantially as and for the purpose specified.

FRANK PROX.

With esses:

J. H. BLAKE, NEWTON ROGERS. 

